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authorLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 12:40:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 12:40:56 -0700
commit763dede1b24886d327bfaed7cf59ee3c01c7913e (patch)
tree14ce76ff54f7c88272a8969c7e23c21c887817d0 /fs
parent762a9f2f0144246872d61bce60085f62992f4ca0 (diff)
parent3676f32a98cd6ed4481c21bceb8b4829d4b6d1cf (diff)
Merge tag 'for-linus-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
Pull UBI and UBIFS updates from Richard Weinberger: - Fix for memory leaks around UBIFS orphan handling - Fix for memory leaks around UBI fastmap - Remove zero-length array from ubi-media.h - Fix for TNC lookup in UBIFS orphan code * tag 'for-linus-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs: ubi: ubi-media.h: Replace zero-length array with flexible-array member ubifs: Fix out-of-bounds memory access caused by abnormal value of node_len ubi: fastmap: Only produce the initial anchor PEB when fastmap is used ubi: fastmap: Free unused fastmap anchor peb during detach ubifs: ubifs_add_orphan: Fix a memory leak bug ubifs: ubifs_jnl_write_inode: Fix a memory leak bug ubifs: Fix ubifs_tnc_lookup() usage in do_kill_orphans()
Diffstat (limited to 'fs')
-rw-r--r--fs/ubifs/io.c16
-rw-r--r--fs/ubifs/journal.c1
-rw-r--r--fs/ubifs/orphan.c13
3 files changed, 24 insertions, 6 deletions
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 8ceb51478800..7e4bfaf2871f 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -225,7 +225,7 @@ int ubifs_is_mapped(const struct ubifs_info *c, int lnum)
int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
int offs, int quiet, int must_chk_crc)
{
- int err = -EINVAL, type, node_len;
+ int err = -EINVAL, type, node_len, dump_node = 1;
uint32_t crc, node_crc, magic;
const struct ubifs_ch *ch = buf;
@@ -278,10 +278,22 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
out_len:
if (!quiet)
ubifs_err(c, "bad node length %d", node_len);
+ if (type == UBIFS_DATA_NODE && node_len > UBIFS_DATA_NODE_SZ)
+ dump_node = 0;
out:
if (!quiet) {
ubifs_err(c, "bad node at LEB %d:%d", lnum, offs);
- ubifs_dump_node(c, buf);
+ if (dump_node) {
+ ubifs_dump_node(c, buf);
+ } else {
+ int safe_len = min3(node_len, c->leb_size - offs,
+ (int)UBIFS_MAX_DATA_NODE_SZ);
+ pr_err("\tprevent out-of-bounds memory access\n");
+ pr_err("\ttruncated data node length %d\n", safe_len);
+ pr_err("\tcorrupted data node:\n");
+ print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1,
+ buf, safe_len, 0);
+ }
dump_stack();
}
return err;
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 3bf8b1fda9d7..e5ec1afe1c66 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -905,6 +905,7 @@ int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode)
ubifs_err(c, "dead directory entry '%s', error %d",
xent->name, err);
ubifs_ro_mode(c, err);
+ kfree(xent);
goto out_release;
}
ubifs_assert(c, ubifs_inode(xino)->xattr);
diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index edf43ddd7dce..283f9eb48410 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -157,7 +157,7 @@ int ubifs_add_orphan(struct ubifs_info *c, ino_t inum)
int err = 0;
ino_t xattr_inum;
union ubifs_key key;
- struct ubifs_dent_node *xent;
+ struct ubifs_dent_node *xent, *pxent = NULL;
struct fscrypt_name nm = {0};
struct ubifs_orphan *xattr_orphan;
struct ubifs_orphan *orphan;
@@ -181,11 +181,16 @@ int ubifs_add_orphan(struct ubifs_info *c, ino_t inum)
xattr_inum = le64_to_cpu(xent->inum);
xattr_orphan = orphan_add(c, xattr_inum, orphan);
- if (IS_ERR(xattr_orphan))
+ if (IS_ERR(xattr_orphan)) {
+ kfree(xent);
return PTR_ERR(xattr_orphan);
+ }
+ kfree(pxent);
+ pxent = xent;
key_read(c, &xent->key, &key);
}
+ kfree(pxent);
return 0;
}
@@ -688,14 +693,14 @@ static int do_kill_orphans(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
ino_key_init(c, &key1, inum);
err = ubifs_tnc_lookup(c, &key1, ino);
- if (err)
+ if (err && err != -ENOENT)
goto out_free;
/*
* Check whether an inode can really get deleted.
* linkat() with O_TMPFILE allows rebirth of an inode.
*/
- if (ino->nlink == 0) {
+ if (err == 0 && ino->nlink == 0) {
dbg_rcvry("deleting orphaned inode %lu",
(unsigned long)inum);